Apple's focus on performance in older iPhones running iOS 12 could help counter the negative publicity around its battery-throttling fiasco and the sneaking suspicious some people have that every new version of iOS makes their iPhone slower.

To keep iPhone owners happy, Craig Federighi, Apple's senior vice president of Software Engineering, said at WWDC that with iOS 12 Apple is "doubling down on performance".

iOS 12 promises to make everything smoother and faster, from app launching to keyboard display and swipe to camera.

At WWDC Apple said apps will launch up to 40 percent faster, while the keyboard comes up 50 percent faster. However, that was based on tests comparing iOS 12 with iOS 11.4 running on an iPhone 6 Plus.

With the first public iOS 12 beta out this week, ZDNet sister site CNET has now tested how much better things will be on the iPhone 5s, the oldest iPhone that iOS 12 supports.

CNET compared iOS 12 against iOS 11.4 on two iPhone 5s 16GB models to get a rough idea how iOS 12 performed under common tasks, like launching Mail, Safari and Maps, as well as the tasks Apple touted.

The good news is that even on this entry-level iPhone there were noticeable speed improvements, according to CNET. Launching Safari was 3.5 seconds faster on iOS 12, while launching Mail was a quarter of second faster.

Sliding to open Camera was also half a second faster, while the keyboard in Messages and Share sheet both came up one second faster. Lastly, Siri was half a second faster on iOS 12.

Hopefully, if results like this carry through to the finished release this fall, iPhone owners won't be feeling remorseful about upgrading to the newest version of iOS.

While performance improvements is the main focus of iOS 12, Apple also updates core apps like FaceTime, which now supports video calls with up to 32 people at once.

And for those with an iPhone X, there's Apple's new Memoji, a different take on its Animoji feature, as well as additional Animoji characters to pick from.

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